<template>
  <view>
    <view class="search-box">
      <!-- 使用 uni-ui 提供的搜索组件 -->
      <uni-search-bar @input="input" :radius="100" cancelButton="none" ></uni-search-bar>
    </view>
    
  <!-- 搜索建议列表 -->
  <view class="sugg-list" v-if="searchResults.length !== 0">
    <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)">
      <view class="goods-name">{{item.goods_name}}</view>
      <uni-icons type="arrowright" size="16" ></uni-icons>
    </view>
  </view>
  
  <!-- 搜索历史 -->
  <view class="history-box" v-else>
    <!-- 标题区域 -->
    <view class="history-title">
      <text>搜索历史</text>
      <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
    </view>
    <!-- 列表区域 -->
    <view class="history-list">
     <uni-tag :text="item" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
    </view>
  </view>
  
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '',
        //搜索结果列表
        searchResults: [],
        //搜索历史的数组
        historyList: []
      };
    },
   onLoad() {
     this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
   },
    methods: {
      //input 输入事件的处理函数
      input(e) {
        //console.log(e)
        clearTimeout(this.timer)
        this.timer = setTimeout(() =>{
          this.kw = e
          this.getSearchList()
        },500)
      },
      // 根据搜索关键词，搜索商品建议列表
      async getSearchList() {
        // 判断关键词是否为空
          if (this.kw === '') {
            this.searchResults = []
            return
          }
          // 发起请求，获取搜索建议列表
          const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
          if (res.meta.status !== 200) return uni.$showMsg()
            this.searchResults = res.message
            
             this.saveSearchHistory()
          
      },
      gotoDetail(item) {
        uni.navigateTo({
           // 指定详情页面的 URL 地址，并传递 goods_id 参数
              url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
       saveSearchHistory() {
         // 直接把搜索关键词 push 到 historyList 数组中
          //this.historyList.push(this.kw)
          const set = new Set(this.historyList)
          set.delete(this.kw)
          set.add(this.kw)
          this.historyList = Array.from(set)
          
          //对搜索历史数据，进行持久化的存储
           uni.setStorageSync('kw', JSON.stringify(this.historyList))
        
        },
       // 清空搜索历史记录
       cleanHistory() {
         // 清空 data 中保存的搜索历史
         this.historyList = []
         // 清空本地存储中记录的搜索历史
         uni.setStorageSync('kw', '[]')
       },
       gotoGoodsList(kw) {
         console.log(kw)
         uni.navigateTo({
           url: '/subpkg/goods_list/goods_list?query=' + kw
         })
       }
    },
    computed: {
      historys() {
        // 注意：由于数组是引用类型，所以不要直接基于原数组调用 reverse 方法，以免修改原数组中元素的顺序
        // 而是应该新建一个内存无关的数组，再进行 reverse 反转
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list {
  padding: 0 5px;
  .sugg-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }
}

.history-box {
  padding: 0 5px;
  .history-title {
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list {
    display: flex;
    flex-wrap: wrap;
    
    .uni-tag {
          margin-top: 5px;
          margin-right: 5px;
          border: 1px solid #efefef;
         background-color: #efefef;
         color: #000;
        }
  }
}
</style>
